After T96917, it should be super easy to add new warnings and errors and such. Let's try adding a warning about the user inputting a file creation date that is in the future (it's not a hard error, the user might have the date misconfigured on their system, or the date might come from a timezone where it already is tomorrow).
Related Gerrit Patches:
|mediawiki/extensions/UploadWizard : master||Warning when file date is in the future|
|Resolved||Sn1per||T117117 Add a warning about choosing a date in the future|
|Resolved||Sn1per||T120905 Generalize the warning system, improve warning handling|